Everyday Objects
Why Do Scissors Have Different Handle Sizes?
Scissors have different handle sizes so multiple fingers fit in the larger loop while just the thumb sits in the smaller one, giving you more control and less fatigue.
objectshandle design
Vehicles
Why Do Cars Have Mirrors on Both Sides?
Cars have mirrors on both sides to eliminate blind spots on each side of the vehicle, giving the driver a view of traffic that cannot be seen through the rear window alone.
vehiclesblind spots
Roads
Why Do Roads Have White and Yellow Lines?
White lines separate traffic moving in the same direction, while yellow lines separate traffic moving in opposite directions. The colour difference tells drivers at a glance how to behave on the road.
roadswhite lines